SWR WM combo clipping problem

I think, You must check your speaker in this combo. Maybe there is a friction between the coil and the magnet in the speaker. You can check this by softly pushing the membrane of your speaker. If you'll feel that the membrane is blocking a problem is following: The coil is not burned-out, but the joint between coil and spring are damage. The cause is simply age of speaker.

 

I found my WM 15 to clip very easily at high volumes as well...
Even when everything was set flat... the aural enhancer will particularly cause the amp to clip sooner if you push it past 12. I damaged my speaker from just playing too loud and pushing the amp too hard... I have since learned my lessons, but the WM 15 unfortunately was the victim of my ignorance... I am however still using the head separately to drive other cabs now...

 

Mine has worked well for me. Yes, the clip light does come on sometimes. But then again, I don't play in loud bands.

As was said, the aural enhancement and excessively-boosted bass will suck up your output without yielding usable volume.

Does the thing work well at lower volumes?

I doubt that it's a speaker problem unless there is an intermittent fault within the speaker.

 

I can only imagine it's a speaker problem or something? I've blown a couple of fuses, but nothing like you are experiencing? The amp does sound good at the volumes it is intended for (ie. 150-200 watt range) sounds really good with the added 210 extension cab too!

A great little head once you know how to use it.